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I still stick to my theory. If the Tesla valve intake produces greater pumping losses either the engine has to be modified to pull the air in with more force or the car will simply not go faster.
It's basic math. If the engine needs 4 fl oz of fuel per minute to cruse at 60mph then it needs about 3 lbs of air per minute. The amount of air that gets sucked in is determined by the design and the total intake resistance. If the intake produces so much pumping losses that it can't suck in more than 3lbs of air per minute then it can't produce enough power to cruise at 60mph.
If it cruises at 60mph it doesn't matter what intake it has. It has the same suction and the same intake resistance and therefore pulls in the same amount of air with the same amount of pumping losses, tesla valve or not.
Putting on a low pumping loss intake won't reduce pumping losses unless you pulse and glide. That's because the throttle valve will make the pumping loss the exact same. If you really did have less pumping losses then that same engine trying to pull in 3lbs of air every minute would start pulling in more air and therefore more fuel which would mean more power and the vehicle would accelerate instead of hold a steady 60mph.
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